Improvement in bleaching stock for paper



UNITED STATES. PATENT OEEIoE.

S. T. MERRILL, OF BELOIT, WISCONSIN.

IMPROVEMENT IN BLEACHING STOCK FOR PAPER.

Specification forming part of Letters Patent No. 70,878, dated November 12, 1867.

To all whom it may concern:

Be it known that I, S. T. MERRILL, of Beloit, in the county of Rock and State of Wisconsin, have made and invented a new and useful Improvement in Bleaching Paper-Stock 5 and I do herebypdeclare that the following is a full, clear, and exact description thereof, which will enable those'skilled lin the art to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

This invention has for its object the bleaching of paper-stock in a more economical manner than hitherto; and consists in subjecting the stock to the action of chlorine gas while the former is undergoing'the process of comminution in what is known as the rag-engine,77 or the stock agitated in a close vessel.

In the accompanying sheet of drawings, Figure l is a side sectional view of my invention, taken in the line a: a', Fig. 2; Fig. 2, a plan or top view of the same.

Similar letters of reference indicate like parts.

A represents an ordinary rag-engine, commonly used for comminuting paper-stock, rags, straw, or other fiber, the work being accomplished by the rotation of a toothed or corrugated cylinder, B, in a concave, C, at the upper part of. a double-inclined elevation, D, in a suitable box or'reservoir, E. These parts, being of ordinary construction, do not require a special description. This rag-engine is provided with a tight cover, F, and the box or reservoir E is supplied with a chlorine solution. When the engine is in operation, muriatic, sulphuric, or other suitable gas is admitted into the box or reservoir E, and chlorine gasis thereby disengaged from the chlorine solution. This gas, in consequence of being closely confined within the box or reservoir E of the engine, attacks or acts upon the ber or stock which is being constantly thrown up and exposed to the gas by the action of the cylinder B, and the ber or stock and the gas thereby brought in direct contact, and the former properly bleached.

In lieu of the rag-engine, an ordinary close vessel may be employed, with an agitator of any suitable kind placed in it, and an acid admitted into the vessel to set free or disenlgage the chlorine gas om the chlorine solu' tion; or chlorine gas may be admitted directly into the vessel. It will be seen, however, that the most desirable and economical plan would be to use the closely-covered rag-engine, as it, by having the close cover, is made to perform simultaneously two dferentfunctions-to wit, its legitimate one of comminuting the stock or ber, and the throwing up of the latter to subject it to the action of the gas.

Having thus described my invention, I claim as new and desire to secure-by Letters Patentengine, or other close vessel provided with an agitator, of chlorine gas, or the disengaging of the latter from a chlorine solution contained' Within the box of the enginevor other vessel,

for the purpose of bleaching paper-stock, substantially as set forth.

The above speciiication of my invention signed by me this 3d day of September, 1867.

S. T. MERRILL.

The introduction into a close-covered rag- 

